Which major observatory became the world's first carbon-neutral astronomical research facility in 2021, using 100% renewable energy and implementing comprehensive waste reduction programs?

The astronomy industry has made significant strides in sustainable practices at observatories and research facilities worldwide. From energy-efficient telescope operations to eco-friendly visitor centers, astronomical organizations are embracing environmental responsibility. This poll tests your knowledge about one of the most impressive sustainability innovations in modern astronomy. How well do you know the intersection of astronomy and environmental consciousness?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

European Southern Observatory (ESO) in Chile
W. M. Keck Observatory in Hawaii
Atacama Large Millimeter Array (ALMA) in Chile
Very Large Telescope (VLT) in Argentina